Pneumatic tool motor rotor with thrust augmentation effect

ABSTRACT

A pneumatic tool motor rotor with thrust augmentation effect has a rotor body in the shape of a three-dimensional cylinder having a circular wall and two end faces, and the circular wall is circularly arranged with multiple concave grooves with preset intervals. Motive blades are configured on the concave grooves, flexible on the radial direction. A power outputting shaft protrudes from the rotor body. Augmenting concave parts are formed nearby the concave grooves on the circular wall of the rotor body and include a wind guiding surface and a pushed augmenting surface, with the facing direction of the pushed augmenting surface being the same as or close to that of the motive blades. Between the pushed augmenting surface and the nearby concave groove, a separating rib is formed, and the wind guiding surface extends outside from the inner end of the pushed augmenting surface and connects with the circular wall.

CROSS-REFERENCE TO RELATED U.S. APPLICATIONS

Not applicable.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

NAMES OF PARTIES TO A JOINT RESEARCH AGREEMENT

Not applicable.

REFERENCE TO AN APPENDIX SUBMITTED ON COMPACT DISC

Not applicable.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a local structure ofpneumatic tools, and more particularly to an innovative structure of apneumatic tool motor rotor with a thrust augmentation effect.

2. Description of Related Art Including Information Disclosed Under 37CFR 1.97 and 37 CFR 1.98.

In the structural design of pneumatic tools (such as a pneumaticspanner, pneumatic handle, pneumatic driver, etc.), the main motion partis the motor rotor inside the cylinder with motive blades circularlyarranged with preset intervals. The motive blades are pushed by thepressure of the air introduced into the cylinder and drive the motorrotor to rotate, and then the rotation of the motor rotor further drivesthe tool end (such as socket, driver head fitting bar) of the pneumatictool to rotate to accomplish its function.

As the rotary motion of the motor rotor is driven by the air pressure,the overall structural design of the motor rotor is directly related tothe driving torque of the pneumatic tool, and is therefore a criticaltechnical concern.

In the structure of present known pneumatic tools, usually the torque ofthe driving rotor is only determined by optimization of the air flowpath and the area configuration of the blades. However, when the maximumsize of the rotor is limited, the maximum area of the blades is alsolimited. There is not much space and possibility for expansion.

Some manufacturers have developed a new driving rotor structure with itsmotive blades formed with concave grooves to accumulate and increase airpressure. In this way, the torque of driving rotor can be enhancedwithout changing the area configuration of the blades. However,according to investigations, such known structure still has itslimitation in actual applications. As the overall area and thickness ofthe blades of the driving rotor is limited (note: particularly so in thecase of small-size pneumatic tool products), removing material from theblades with limited area and thickness to form concave grooves withsufficient air pressure accumulation will obviously affect thestructural strength of the blades. Moreover, in the case of drivingrotors having a need for torque augmentation in both normal and reverserotational directions, it is necessary to form the above-mentionedgrooves on both sides of the blades. However, as the thickness of thedriving rotor blades is usually only about 3 mm, to form concave grooveson both sides of the blades and maintain sufficient thickness betweenthe relative grooves, the depth of the concave grooves can not be largeenough for sufficient augmentation effect. Hence, such known structurewith air pressure augmentation through rotor blades is still not perfectand needs some improvement.

Thus, to overcome the aforementioned problems of the prior art, it wouldbe an advancement in the art to provide an improved structure that cansignificantly improve the efficacy.

Therefore, the inventor has provided the present invention ofpracticability after deliberate design and evaluation based on years ofexperience in the production, development and design of relatedproducts.

BRIEF SUMMARY OF THE INVENTION

The present invention discloses a “pneumatic tool motor rotor withthrust augmentation effect” with an innovative and unique structuraldesign featuring augmenting concave parts arranged between the concavegrooves on the circular wall of the rotor body. In contrast to knownstructures introduced in “prior art”, when the motor rotor is pushed byair pressure inside the pneumatic tool, the air pressure receiving areacan be expanded through the pushed augmenting surfaces of the augmentingconcave parts. Therefore, the present invention has a practicaladvancement and advantage to effectively enhance the rotational torqueof the motor rotor without changing the overall size of the motor rotor.On the other hand, through arrangement of the augmenting concave parts,the present invention makes it possible to remove some material from therotor body structure and form a strengthening rib structure (i.e.separating rib 50 parts) between the neighboring concave grooves. Thelightweight design and enhanced structural strength of the motor rotorobviously constitute another practical advancement and advantage.

Although the invention has been explained in relation to its preferredembodiment, it is to be understood that many other possiblemodifications and variations can be made without departing from thespirit and scope of the invention as hereinafter claimed.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a perspective view of a preferred embodiment of the presentinvention (note: local components are shown in exploded state).

FIG. 2 is a plane sectional view of a preferred embodiment of thepresent invention.

FIG. 3 shows another embodiment of the augmenting concave parts of thepresent invention.

FIG. 4 shows the application state of the present invention.

FIG. 5 is an enlarged view of Part B in FIG. 4.

FIG. 6 is an illustrative view of the augmenting concave parts of thepresent invention with opposite configuration.

FIG. 7 shows an embodiment of the present invention with the rotor bodyhaving a hollow chamber to hold a hammering component.

DETAILED DESCRIPTION OF THE INVENTION

FIGS. 1 and 2 depict a preferred embodiment of the pneumatic tool motorrotor with thrust augmentation effect. However, such an embodiment isonly for the purpose of illustration, and is not intending to limit thescope of patent application.

Said motor rotor A comprises a rotor body 10, in the shape of athree-dimensional cylinder having a circular wall 11 and two end faces12, 13, and the circular wall 11 is circularly arranged with multipleconcave grooves 14 with preset intervals.

Multiple motive blades 20 are configured on the concave grooves 14formed on the circular wall 11 of the rotor body 10, flexible on theradial direction.

A power outputting shaft 30 protrudes from one end face 12 of the rotorbody 10.

Multiple augmenting concave parts 40 are concavely formed nearby theconcave grooves 14 on the circular wall 11 of the rotor body 10,wherein, said augmenting concave parts 40 include a wind guiding surface41 and a pushed augmenting surface 42, with the facing direction of thepushed augmenting surface 42 being the same as or close to that of themotive blades 20, moreover, between the pushed augmenting surface 42 andthe nearby concave groove 14, a separating rib 50 is formed, and thewind guiding surface 41 extends outside from the inner end of the pushedaugmenting surface 42 (note: can be configured in the form of slopeextension or arc extension) and connect with the circular wall 11.

Referring to FIGS. 3 and 4, based on the above structural design, whenthe motor rotor A in the pneumatic tool is pushed by air pressure (asmarked by Arrow W), the pressure receiving area (marked by L1 in FIG. 4)can be enlarged through the pushed augmenting surface 42 of theaugmenting concave parts 40, so as to effectively increase the airpushing force received by the rotor body 10, and consequently enhancethe rotational torque of the motor rotor A.

Referring to FIG. 6, between the neighboring concave grooves 14, twoaugmenting concave parts 40 can be formed with opposite pusheddirections, wherein the slanting directions of the wind guiding surfaces41 of the two augmenting concave parts 40 are opposite of each other,and the pushed augmenting surfaces 42 of the two augmenting concaveparts 40 are adjacent to different concave grooves 14. Based on this, inthe cases of both normal or reverse rotation of the motor rotor A,augmentation can be accomplished through the augmenting concave parts 40(as marked by Arrows L2 and L3 in FIG. 6).

Referring to FIG. 1, the part between the augmenting concave parts 40and the two end faces 12, 13 of the rotor body 10 can be arranged aslocal sections with some spacing (L4).

Referring to FIG. 3, the augmenting concave parts 40 can also bearranged as a full section with its two ends going through the rotorbody 10 to the two end faces 12, 13.

Referring to FIG. 2, the inside of the rotor body 10 can be in a solidstyle.

Further, referring to FIG. 7, the inside of the rotor body 10B can alsohave a hollow chamber 60, said hollow chamber 60 can hold a hammeringcomponent 70, so as to form a rotor body 10 with built-in hammeringfunction. The structural detail of the hammering component 70 is a knowntechnique not covered by the present invention, and is therefore notintroduced herein.

1. A pneumatic tool motor rotor with thrust augmentation effectcomprising: a rotor body, in the shape of a three-dimensional cylinderhaving a circular wall and two end faces, and the circular wall iscircularly arranged with multiple concave grooves with preset intervals;multiple motive blades, configured on the concave grooves formed on thecircular wall of the rotor body, flexible on the radial direction; apower outputting shaft, protruding from one end face of the rotor body;multiple augmenting concave parts, concavely formed nearby the concavegrooves on the circular wall of the rotor body, wherein, said augmentingconcave parts include a wind guiding surface and a pushed augmentingsurface, with the facing direction of the pushed augmenting surfacebeing the same as or close to that of the motive blades, moreover,between the pushed augmenting surface and the nearby concave groove, aseparating rib is formed, and the wind guiding surface extends outsidefrom the inner end of the pushed augmenting surface and connect with thecircular wall; thus, when the motor rotor in the pneumatic tool ispushed by air pressure, the pressure receiving area can be enlargedthrough the pushed augmenting surface of the augmenting concave parts,so as to enhance the rotational torque of the motor rotor.
 2. Thestructure defined in claim 1, wherein, between the neighboring concavegrooves, two augmenting concave parts are formed with opposite pusheddirections, wherein the slanting directions of the wind guiding surfacesof the two augmenting concave parts are opposite of each other, and thepushed augmenting surfaces of the two augmenting concave parts areadjacent to different concave grooves; based on this, in the cases ofboth normal or reverse rotation of the motor rotor, augmentation can beaccomplished through the augmenting concave parts.
 3. The structuredefined in claim 2, wherein the part between the augmenting concaveparts and the two end faces of the rotor body is arranged as localsections with some spacing.
 4. The structure defined in claim 2, whereinthe augmenting concave parts are arranged as a full section with its twoends going through the rotor body to the two end faces.
 5. The structuredefined in claim 3, wherein the inside of the rotor body is in a solidstyle.
 6. The structure defined in claim 3, wherein the inside of therotor body has a hollow chamber, said hollow chamber is arranged to holda hammering component, so as to form a rotor body with built-inhammering function.